Ask Trevor CHT: What is an EMG and how is it different from conductive nerve testing?

Ben asks:

"What is an EMG and how is it different from conductive nerve testing?"

Trevor's answer:

"An EMG, or Electromyogram, passively measures the amount of electrical activity of a given muscle both at rest and during activity.

Depending on the muscle, either a needle is inserted into a muscle or an electrode is placed over one and the doctor will take a reading of the electrical activity at rest then ask you to actively cause a muscle contraction. 

A nerve conduction test or nerve velocity test actively transmits an electrical signal through a nerve and measures how long it takes the signal to travel a certain distance."

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